166265901 has 24 divisors (see below), whose sum is σ = 247869440. Its totient is φ = 107316576.

The previous prime is 166265881. The next prime is 166265959. The reversal of 166265901 is 109562661.

166265901 is a `hidden beast` number, since 1 + 6 + 62 + 6 + 590 + 1 = 666.

It is not a de Polignac number, because 166265901 - 2⁷ = 166265773 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166265201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 73140 + ... + 75378.

Almost surely, 2^166265901 is an apocalyptic number.

It is an amenable number.

166265901 is a deficient number, since it is larger than the sum of its proper divisors (81603539).

166265901 is a wasteful number, since it uses less digits than its factorization.

166265901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505 (or 2502 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 166265901 is about 12894.4135578164. The cubic root of 166265901 is about 549.8797544291.

The spelling of 166265901 in words is "one hundred sixty-six million, two hundred sixty-five thousand, nine hundred one".